74% (2002)

71% (1992)

60% (2004)

78% (2004)

60% (1999)

70% (2002)

53% (2008)

77% (1999)

71% (1988)

67% (2008)

72% (1994)

71% (1979)

72% (2004)

76% (1986)

68% (1989)

62% (1997)

78% (1969)

55% (1997)

32% (1999)

61% (1982)